Relay



Sept. 1, 1936. R1 PALMER 2,053,102

RELAY Filed Feb. 24, 1934 I NEENTQ ATTORNEY Patented Sept. 1, 1936 IUNITED STATES PATENT OFFICE RELAY Ralph L. Palmer, Endlcott, N. n,assignor to International Business Machines Corporation, New York, N.Y., a. corporation of New York Application February 24, 1934. Serial No.712,688

1 Claim.

This invention relates to relays and more particularly relays of thetype used in controlling the operation of electric accounting machines.

The main object of the invention is to provide 10 around the outside ofthe tube. With this arrangement, the contact points are efiectivelyprotected against dirt, oil, etc., which might otherwise accumulate onthe contact points and interfere with the proper operation. Thisarrangel5 ment also serves to reduce the possibility of arcing at thecontacts and, due to the absence of gases within the tube, there is nowear on the contact points themselves.

Various other objects and advantages oi the 20 invention will be obviousfrom the following particular description oi one form of mechanismembodying the invention or from an inspection of the accompanyingdrawing; and the invention also constitutes certain new and novelfeatures oi 25 construction and combination of parts hereinafter setforth and claimed.

In the drawing: .Fig. 1 is a central section of the complete relay.Figs. 2, 3, and 4 are sectional views taken on 30 lines 22, 33, and 4-4,respectively, of Fig. I.

The contacts and cores of .the relay are enclosed within the glass tube[0. Core H comprises a number of metallic rings supported on one endoirods l2 and core l3 comprisesa num- 35 be: of rings secured at theopposite ends of rods l2. A rod I4 mounted in core I! serves as a pivotfor armature I5 upon which are mounted spring contact blades it, whichnormally occupy the position shown. The free end of blade l6 coop- 4crates with fixed contact points I1 and it. These contacts are integralwith insulated disks I! and 20, respectivelynwhich are supported by rods12 and insulated from one another. In Fig. 2, two sets of contact pointsare shown and separate 4 insulated disks are provided for the separatepoints. Each of the disks is provided with a terminal 2| which iswiredto leads "extending through the seal of the tube to contacting prongs 23through which connections are made to the machine devices to becontrolled. After the contact assembly has been inserted in the tube to,it may be secured in place by spot blasting at sev- 5' eral points, suchas 24, to hold the parts in position within the tube. The coil orwinding is indicated at 25 and is contained within a casing 26 which isadapted to fit over the base 21 as shown.

Windows or openings 28 are provided so that the contact points may beobserved without removing the casing 26. The leads from the winding 25may also be arranged to terminate in two of the prongs 23 so that allconnections between the relay and the circuits of the machine with 5which it is to be associated are made through this medium and theinclusion of the relay in the machine circuits is reduced to a simplematter of inserting the prongs 23 in a suitable socket. The rings ofcore l3 (Fig. 3) have a flat surface which is spaced from the free endof armature l5 to provide an air gap 29.

While there has been shown and described and pointed out the fundamentalnovel features of the invention as applied to a single modification, itwill be understood that various omissions and substitutions and changesin the form and details of the device illustrated and in its operationmay bemade by those skilled in the art without departing from the spiritof the inven- 30 tion. It is the intention therefore to be limited onlyas indicated by the scope of the following claim.

What is claimed is as follows:

A replaceable relay comprising in combination, an evacuated tube, acasing enclosing said tube, contact prongs extending from said casing, apair of spaced pole pieces within said tube, an armature pivoted to oneof said pole pieces, the free end of said armature being adapted to 40extend within an opening in the other of said pole pieces, contactpoints carried by said armature, said contacts being connected to saidprongs, and a winding encircling said tube and lying within said casing.

RALPH L. PALMER.

